Center for Fast Kinetics Research, Patterson 131, University of Texas at Austin, Austin, TX 78712 U.S.A.
Abstract:
Laser flash photolysis techniques have yielded rate constants for physical and reactive quenching modes of by nicotine, nicotinamide adenine dinucleotide (oxidized and reduced forms) and the reduced forms of nicotinamide mononucleotide, nicotinamide adenine dinucleotide phosphate and nicotinamide hypoxanthine dinucleotide. In the case of the last four named compounds, kinetic spectroscopy furnished evidence for one-electron transfers to . Specifically, production of O?2 was demonstrated unequivocally by reaction with 1,4-benzoquinone. Quantitative determinations revealed the extent of reactive quenching to be near 60% in each case.